<template>
  <div class="home-page">

  <div class="banner">
    <div class="container">
      <h1 class="logo-font">conduit</h1>
      <p>A place to share your knowledge.</p>
    </div>
  </div>

  <div class="container page">
    <div class="row">

      <div class="col-md-9">
        <div class="feed-toggle">
          <ul class="nav nav-pills outline-active">
            <li class="nav-item" v-if="user">
              <nuxt-link class="nav-link"
              :class="{active: tab==='your_feed'}"
              :to="{name:'home',query:{tab:'your_feed'}}"
              exact
              >Your Feed</nuxt-link>
            </li>
            <li class="nav-item">
              <!-- <a class="nav-link active" href="">Global Feed</a> -->
              <nuxt-link class="nav-link"
              :class="{active: tab==='global_feed'}"
              :to="{name:'home'}"
              exact
              >Global Feed</nuxt-link>
            </li>
            <li class="nav-item" v-if="tag">
              <nuxt-link class="nav-link"
              :class="{active: tab==='tab'}"
              :to="{name:'home',query:{tab:'tab'}}"
              exact
              ># {{ tag }}</nuxt-link>
            </li>
          </ul>
        </div>

        <div class="article-preview"
        v-for="article in articles" :key="article.slug"
        >
          <div class="article-meta">
            <nuxt-link
            :to="{name: 'profile', params: {username:article.author.username}}">
              <img :src="article.author.image" />
            </nuxt-link>
            <!-- <a href="profile.html"><img src="http://i.imgur.com/Qr71crq.jpg" /></a> -->
            <div class="info">
              <!-- <a href="" class="author">Eric Simons</a> -->
              <nuxt-link class="author"
              :to="{name: 'profile', params: {username:article.author.username}}">
                {{article.author.username}}
              </nuxt-link>
              <span class="date">{{article.createdAt | date('MMM DD, YYYY')}}</span>
            </div>
            <button class="btn btn-outline-primary btn-sm pull-xs-right"
            :class="{active:article.favorited}"
            @click="onFavorite(article)"
            :disabled="article.favoriteDisabled"
            >
              <i class="ion-heart"></i> {{article.favoritesCount}}
            </button>
          </div>
          <nuxt-link :to="{name:'article',params:{slug:article.slug}}"
          class="preview-link">
            <h1>{{article.title}}</h1>
            <p>{{article.description}}</p>
            <span>Read more ...</span>
          </nuxt-link>
        </div>
        <nav>
          <ul class="pagination">
            <li class="page-item"
            v-for="item in totalPage" :key="item"
            :class="{active: item===page}"
            >
              <nuxt-link :to="{name:'home',query:{page:item,tag:$route.query.tag,tab:tab}}" class="page-link">{{item}}</nuxt-link>
            </li>
          </ul>
        </nav>
      </div>

      <div class="col-md-3">
        <div class="sidebar">
          <p>Popular Tags</p>

          <div class="tag-list">
            <nuxt-link
            v-for="item in tags" :key="item"
            :to="{name: 'home',query:{tag:item,tab:'tab'}}"
            class="tag-pill tag-default">{{item}}</nuxt-link>
          </div>
        </div>
      </div>

    </div>
  </div>

</div>
</template>

<script>
  import { getArticles, getYourFeedArticles, addFavorite, deleteFavorite } from '@/api/article'
  import { getTags } from '@/api/tag'
  import { mapState } from 'vuex'
  export default {
    name: "homeIndex",
    async asyncData ({query}) {
      const page = Number.parseInt(query.page || 1)
      const limit = 20
      const tab = query.tab || 'global_feed'
      const tag = query.tag

      const loadArticles = tab === 'your_feed' ? getYourFeedArticles : getArticles
      const [articleRes,tagRes] = await Promise.all([
        loadArticles({
          limit,
          offset: (page-1)*limit,
          tag
        }),
        getTags()
      ])
      const {articles,articlesCount} = articleRes.data
      const {tags} = tagRes.data
      articles.forEach(article => article.favoriteDisabled = false)
      return {
        articles,
        articlesCount,
        limit,
        page,
        tags,
        tag,
        tab
      }
    },
    head () {
      return {
        title: `RealWorld`
      }
    },
    watchQuery: ['page','tag','tab'],
    computed: {
      ...mapState(['user']),
      totalPage(){
        return Math.ceil(this.articlesCount / this.limit)
      }
    },
    methods: {
      async onFavorite(article) {
        article.favoriteDisabled = true
        if(article.favorited) {
          await deleteFavorite(article.slug)
          article.favorited = false
          article.favoritesCount-=1
        } else {
          await addFavorite(article.slug)
          article.favorited = true
          article.favoritesCount+=1
        }
        article.favoriteDisabled = false
      }
    }
  }
</script>

<style lang="sass" scoped>

</style>